I own four Beeman R1’s. One in .177 tuned to 12 ft/lbs, one in .177 full power, one in .20, and one in .22. The 12 ft/lb gun is quieter, but that is to be expected. However, given the mass of the moving parts the parts oscillate after the shot. There is no twang, you can actually feel the spring going front to back, probably piston bounce. All of the full powered guns have about the same report, it’s the same action... In ft/lbs however, the .177 gun is lacking, even when shooting heavier pellets than the .20. Discounting pellet weights and just shooting what each gun shoots well, it falls out as follows:
caliber weight in gr ft/lbs
.177 10.34 13.22
.20 11.42 18.86
.22 14.35 16.96
The .177 gun kills on both ends because it is so harsh. The .20 and .22 guns are both very smooth. The .177 and .20 guns both have the same Vortek kit in them. The .22 was professionally tuned. I don’t recommend an R1 in .177. I don’t think its a good fit. I don‘t recommend it in .25 either though, because I had that and sold it. The velocity fell off way too much. The .177’s are fine. You are just wasting a large power plant. The .20 is my favorite, but .22 is not bad and much easier to find pellets for.
Just my two cents, your mileage may vary.
RS